Frank dtjnworth



UNITED STATES PATENT OFFICE.

FRANK DUNWORTH, OF NElV YORK, N. Y.

PENClL-SHARPEN ER.

SPECIFICATION forming part of Letters Patent No. 422,126, dated February25, 1890.

Application filed August 16, 1889. Serial No.320,99l.. (ModeL) To allwhom it may concern.-

Be it known that I, FRANK DUNWORTH, of New York city, in the county andState of New York, have invented a new and Improved Pencil-Sharpener, ofwhich the following is a full, clear, and exact description.

My invention relates to an improvement in pencil-sharpeners especiallyadapted for application to the frame of a slate, to a desk, or to anequivalent support, and has for its object to provide a sharpener ofsimple and durable construction, whereby a slate or lead pencil may besharpened by being drawn in contact with the device and a more or lesstapering point be imparted to the pencil, as may be desired.

The invention consists in the novel construction and combination of theseveral parts, as Will be hereinafter fully set forth, and pointed outin the claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar figures of reference indicatecorresponding parts in all the views.

Figure 1 is a perspective View of a slate, illustrating the applicationof the device thereto and a pencil in position for sharpening. Fig. 2 isa partial side elevation of a slate, illustrating the device enlargedand in perspective. Fig. 3 is a similar view of the device, illustratingit applied to a desk and adapted for use in connection with aleadpencil. Fig. 4 is a perspective View of the device detached from itssupport, and Fig. 5 is a section on line y y of Fig. 4. i

The principal feature of the invention consists of a knife 10,constructed in staple form, as illustrated in Fig. 4, one perpendicularmember 11 being preferably longer than the opposite member 12, and thebow or cutting section 13 of the knife is beveled downward upon eachside to form a lower cutting-edge 14, whereby the said bow or cuttingsection is essentially wedge-shaped in cross-section, as illustrated at15 in Fig. 5.

I11 applying the knife to a slate-frame the members 11 and 12 are drivenin the edge of the frame, as illustrated in Figs. 1 and 2, in suchmanner that the cutting-edge will be at an angle to the edge of theframe, which po sition is readily assumed by the knife as it is drivenby reason of one of its straight memsimilar recess is formed in thatportion of the desk into which the knife is driven, as illustrated inFig. 3.

To sharpen a pencil, it is introduced beneath the knife at the elevatedend of the same, and the pencil is then drawn quickly in the directionof the lower end in contact with the cutting-edge of the blade, thefirst position of the pencil being illustrated in Fig. 1. By this meansthe surface of the pencil contacting with the cutting-edge of the knifeis tapered, and a regular tapering point is produced by repeating thisoperation and turning the pencil each time it is drawn downward.

I desire it to be understood that by setting the knife at a greaterangle than illustrated the recess in the knife-support may be dispensedwith.

Having thus described my invention, I claim as new and desire to secureby Letters Patent 1. The combination, with a table, frame, or othersupport, of a staple-shaped knife having a downwardly-inclinedbow-section provided with a lower cutting-edge, the cuttingedge of whichknife ,is at an angle to the table, frame, or other support,substantially as and for the purpose specified.

2. The combination, with a table, frame, or other support provided witha recess having an inclined base-wall, of a staple-shaped knife drivenin the frame or support over the recess, one end being lower than theother, the bow-s'ection of which knife is essentially wedge-shaped incross-section, substantially as shown and described, and for the purposespecified.

FRANK DUNWORTH.

Witnesses:

J. F. AOKER, J12, O. SEDewIoK.

